.\" $OpenBSD: tls_client.3,v 1.4 2017/08/12 03:41:48 jsing Exp $
.\"
.\" Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
.\"
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.\" purpose with or without fee is hereby granted, provided that the above
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.Dd $Mdocdate: August 12 2017 $
.Dt TLS_CLIENT 3
.Os
.Sh NAME
.Nm tls_client ,
.Nm tls_server ,
.Nm tls_configure ,
.Nm tls_reset ,
.Nm tls_free
.Nd configure a TLS connection
.Sh SYNOPSIS
.In tls.h
.Ft struct tls *
.Fn tls_client void
.Ft struct tls *
.Fn tls_server void
.Ft int
.Fo tls_configure
.Fa "struct tls *ctx"
.Fa "struct tls_config *config"
.Fc
.Ft void
.Fn tls_free "struct tls *ctx"
.Ft void
.Fn tls_reset "struct tls *ctx"
.Sh DESCRIPTION
A TLS connection is represented as a
.Vt struct tls
object called a
.Dq context .
A new context is created by either the
.Fn tls_client
or
.Fn tls_server
functions.
.Fn tls_client
is used in TLS client programs,
.Fn tls_server
in TLS server programs.
.Pp
The context can then be configured with the function
.Fn tls_configure .
The same
.Vt tls_config
object can be used to configure multiple contexts.
.Pp
After configuration,
.Xr tls_connect 3
can be called on objects created with
.Fn tls_client ,
and
.Xr tls_accept_socket 3
on objects created with
.Fn tls_server .
.Pp
After use, a TLS context should be closed with
.Xr tls_close 3 ,
and then freed by calling
.Fn tls_free .
If
.Fn tls_free
is called with an argument of
.Dv NULL ,
no action occurs.
.Pp
A TLS context can be reset by calling
.Fn tls_reset ,
allowing for it to be reused.
This is essentially equivalent to calling
.Fn tls_free ,
followed by a call to the same function that was used to originally allocate
the TLS context.
.Sh RETURN VALUES
.Fn tls_client
and
.Fn tls_server
return
.Dv NULL
on error or an out of memory condition.
.Pp
.Fn tls_configure
returns 0 on success or -1 on error.
.Sh SEE ALSO
.Xr tls_accept_socket 3 ,
.Xr tls_config_new 3 ,
.Xr tls_connect 3 ,
.Xr tls_init 3
.Sh HISTORY
These functions appeared in
.Ox 5.6
and got their final names in
.Ox 5.7 .
.Sh AUTHORS
.An Joel Sing Aq Mt jsing@openbsd.org
